Emperor Go-Komatsu (後小松天皇 Go-Komatsu-tennō) was the 100th emperor of Japan, according to the traditional order of succession.

He is officially considered to have been a pretender from May 24, 1382 to October 21, 1392, when Emperor Go-Kameyama abdicated. He is understood to have been a legitimate emperor (the 100th sovereign) from that date until October 5, 1412. According to pre-Meiji scholars, his reign spanned the years from 1392 through 1412.

This Nanboku-chō "sovereign" was named after the 9th-century Emperor Kōkō, and go- (後), translates literally as "later." Jien's Gukanshō explains that Kōkō was called "the Emperor of Komatsu". The 14th-century pretender and emperor may be called the "later Emperor Kōkō" or the "later Emperor Komatsu". The Japanese word go has also been translated to mean the "second one;" and in some older sources, this would-be emperor may be identified as "Komatsu, the second", or as "Komatsu II".